402978563 has 4 divisors (see below), whose sum is σ = 433976928. Its totient is φ = 371980200.

The previous prime is 402978533. The next prime is 402978593. The reversal of 402978563 is 365879204.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (402978533) and next prime (402978593).

It is a cyclic number.

It is not a de Polignac number, because 402978563 - 2⁸ = 402978307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402978533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15499163 + ... + 15499188.

It is an arithmetic number, because the mean of its divisors is an integer number (108494232).

Almost surely, 2^402978563 is an apocalyptic number.

402978563 is a deficient number, since it is larger than the sum of its proper divisors (30998365).

402978563 is a wasteful number, since it uses less digits than its factorization.

402978563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30998364.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 402978563 is about 20074.3259662685. The cubic root of 402978563 is about 738.6306322711.

The spelling of 402978563 in words is "four hundred two million, nine hundred seventy-eight thousand, five hundred sixty-three".